Airtac PU Straight Fitting PU12D
The AirTAC Airtac PU Straight Fitting PU12D is a genuine straight union for push-in tube connection, rated 0 - 1.0 MPa (0 - 10 kgf/cm2) with a 1.5 MPa proof pressure.
- TypeStraight union
- SeriesPU
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- Temperature-20 to +70 °C
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac PU Straight Fitting PU12D
The PU12D is an AirTAC PU straight union, a tube-to-tube one-touch fitting that joins two lengths of Dia 12 mm soft nylon or polyurethane tubing in a straight line. There is no thread on this part at all, so no thread sealant, port tapping or wrench work is involved: push each tube into its chuck until it seats, the stainless spring gasket and chuck grip it, and pressing the release ring frees it again.
It runs on the resin one-touch spec profile: 0-1.0 MPa working pressure (0-10 kgf/cm2), 1.5 MPa proof pressure, -750 mmHg vacuum, and -20 to +70 C. The D suffix makes this the black version - on the PU union the colour carries through the body, not just the button, which matters where a dark fitting is preferred on visible runs. Because both ends take Dia 12 tube only, this union suits a machine's main air drop rather than branch or instrument lines.
Airtac PU Straight Fitting PU12D Technical Specifications
| Model | Airtac PU Straight Fitting PU12D |
|---|---|
| Type | Straight union |
| Series | PU |
| Connection | Push-in one-touch |
| Working pressure | 0 - 1.0 MPa (0 - 10 kgf/cm2) |
|---|---|
| Negative pressure | -750 mmHg (10 Torr) |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Applicable tubing | Soft nylon or polyurethane tube |
| Thread standard | PT (Rc tapered) unless the code says otherwise |
POM release button and chuck, aluminium-alloy guide, stainless spring gasket, NBR O-ring; body brass or PBT depending on the part. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac PU Straight Fitting PU12D
| PU | Straight union. |
|---|---|
| 4 / 6 / 8 / 10 / 12 | Tube outside diameter in mm (3.2 mm exists on the mini series). |
| M5 / 01 / 02 / 03 / 04 | Thread: M5x0.8, 1/8", 1/4", 3/8", 1/2" (M3 on the mini series). |
| D | Black. Blank = grey. |
Fitting & Sealing Notes
- check Cut the tube square and clean before pushing it home, or the seal will leak.
- check Push until it stops, then pull back to check the chuck has gripped.
- check To release, press the collet ring fully in and pull the tube out.
- check Threaded parts arrive with sealant on the thread; M5 sizes use a sealing gasket.
- check Match the tube OD exactly - a 6 mm fitting will not hold 1/4" tube.
Where the Airtac PU Straight Fitting PU12D Is Used
Main air drop on a punch press
Splicing or extending the 12 mm supply run from an FRL regulator to the press valve manifold, where a straight in-line joint keeps the drop short and pull-out resistant.
Vacuum line on a pick-and-place gantry
Joining 12 mm suction-line tubing ahead of a venturi ejector; the union's -750 mmHg rating means the joint survives vacuum service, not just pressure.
Conveyor air-knife supply in a food plant
Butt-joining black 12 mm polyurethane runs feeding blowing nozzles, where the dark body disappears against the machine frame and quick release lets hygiene teams swap line sections.
Is the Airtac PU Straight Fitting PU12D the Right Part?
Dia 12 is the top of the PU ladder, so the only neighbour is one step down: the PU10, which pairs 10 mm tube on both ends. Stepping from 10 to 12 mm gives you a larger bore through the joint, which is the usual reason to move up on a long main run; there is no Dia 16 union in this catalogue, so 12 mm is the ceiling. If you need to step a Dia 12 line down to a smaller actuator feed, use a PG different-diameter straight or a PKG reducer union instead of forcing a mismatch.
Check both tubing reels before ordering: a one-touch union only holds tube whose OD matches the code exactly, so Dia 12 is Dia 12 on both sides - there is no imperial 1/2 in equivalent on this page. If the joint has to pass through a panel wall, AirTAC's PM bulkhead union is the shape for that job, not this straight-through body.
Quick checklist
- ✓ Tube outside diameter matches exactly
- ✓ Thread size and standard match the port
- ✓ Working pressure within 0 - 1.0 MPa (0 - 10 kgf/cm2)
- ✓ Temperature within -20 to +70 °C
Airtac PU Straight Fitting PU12D FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, vacuum down to -750 mmHg (10 Torr), and a temperature range of -20 to +70 C. It is a straight union accepting Dia 12 mm soft nylon or polyurethane tube in both ends, with no thread. Applicable tubing type is soft nylon or PU only.
No. Both chucks are Dia 12 only; a one-touch fitting does not grip tube of a different OD than its code. Order a PU10 for a 10-to-10 joint, or for a genuine size change use a PG different-diameter straight or a PGJ plug-in reducer, which are designed for mixed tube sizes.
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Covers non-human-caused product damage.
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